To make any changes to the looks Of Ubuntu you need to install the gnome tweak tool. To install it copy+paste the following line:

sudo apt-get install -y gnome-tweak-tool

When installed you can close the terminal window.

Changing your icons

You can change the icons by openening the Advanced Settings, for some reason gnome-tweak-tool is called Advanced Settings when it’s installed. To open the advanced settings press SuperKey and type: advanced settings and click on the launcher. Click on the Theme option then on the Icon Theme button and select the Faenza icons you want to use.

When done you can close the advanced settings window and you need to logout and back in again.